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Changes in Matter - 5th Grade

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by

William Begoyan

on 7 January 2016

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Transcript of Changes in Matter - 5th Grade

Changes in Matter
5th Grade

By: Mr. Begoyan
Physical Changes
Physical changes occur when
no new
substance is formed.
Melting ice, boiling and freezing water, tearing paper are all examples of physical changes.
Easily reversible.
Chemical Changes
Chemical changes occur when one or more new substances are produced. We call them
chemical reactions.
Combining certain elements and compounds together, or applying heat to some compounds can produce new substances.
Difficult to reverse (sometime impossible).
Reactivity
Some substances are more likely to undergo chemical changes than others.
Reactivity measures how likely (and how violent) a chemical reaction is likely to occur.
Using Chemical Reactions
At the end of a chemical reaction, you will often find a new substance.
Some compounds can only be obtained through chemical reactions.
Reacting sodium and chlorine results in table salt.
Combustibility
Some elements and compounds can undergo a special chemical reaction:
combustion
.
During combustion, heat and light is produced.
Different chemicals will produce different colors as they combust.
Conservation of Matter
Physical and chemical changes may cause matter to look and behave differently, but the amount of matter never changes (you don't create or lose matter).
This is called the
"Law of Conservation of Matter"
.
Questions
1. What is the difference between a physical and chemical change?

2. What is reactivity?

3. What are some uses for chemical reactions?

4. Describe combustibility.

5. What does the "Law of Conservation of Matter" say?
Page 15 in ISN
Pages c22-c27 in textbook.
Full transcript